Boiler



"NOMOMU P. LUDWIG.

BOILER.

No. 403,599. I Patented May 21, 1889.

NITEI) STnTEs PATENT OFFICE.

FREDERICK IIUDIVIG, OF GIJENCOE, MINNESOTA.

n BOILER.

SPECIFICATION forming part of Letters Patent No. 403,599, dated May 21,1889.

Application filed August 30, 1888. Serial No. 284,127. (No model.)

To all whom, it may concern:

Be it known that I, FREDERICK LUDWIG, of Glencoe, in the county ofMcLeod and State of Minnesota, have invented certain new and usefulImprovements in Boilers, of which the following is a specification.

My invention relates to boilers designed more particularly for use uponlocomotives, and has reference to a novel construction of the boileritself, all as hereinafter set forth and claimed.

The boiler in its general plan resembles that for which Letters PatentNo. 372,422 were granted to me, bearing date November l, 1887.

In the drawings, Figure l is a longitudinal sectional view through myimproved boiler; Fig. 2, a vertical sectional view on the line 2 2; Fig.3, a similar view on the line 3 3.

A indicates the boiler proper, B the fire-box or chamber, and C theU-shaped shell partially surrounding the boiler, as shown. This shell Cis riveted to the boiler A, and its front is set somewhat in advance ofthe front of the former, as shown in Fig. l, so as to form an opening,a, by means of which water may pass from the boiler into the shell. Theshell C extends in rear of the boiler, and its end is turned upward toform an upright waterchamber, D, which latter forms the rear end of thesmoke-chamber, as shown in Fig. l, while a fire-brick covering', E,closes the upper side of the said smoke-chamber. From this constructionit will be seen that the smokechamber is surrounded on nearly all sidesby a water-chamber, and consequently all of the heat will be utilized.The upright waterchamber D is connected at its upper end, above theupper row of iiues, with the boiler A by means of a number of pipes, F,which, instead of extending transversely across the smoke-chamber, as inmy former patent, extend longitudinally thereof, as shown in Fig. l. Theconstruction of the hollow threaded-bolts, by which the tubes or pipesare connected with the shell C, is substantially the same as in myformer patent, to which reference is hereby made.

To further utilize the products of combustion and to expose the greatestamount ot surface to the heat,I place within the horizontal portion ofthe smoke-chamber a series of pipes, G, connected at their rear ends, by

means of hollow bolts G', with the lower end of the uprightwater-chamber D, and screwing at theirv forward ends into a hollow boxor chamber, H, as shown in Figs. l and 3. This hollow box or chamber His secured to the shell C by means of hollow bolts H', as shown in Figs.l and 3, which bolts permit the water to pass from the shell into thehollow box, or Vice versa.

Directly opposite the ends of the pipes G the box H is provided withremovable plugs H2, so that byremoving them and the plugs G2 in the endsof the hollow bolts G' the pipes may be cleaned.

In order to further utilize the heat, the grate-bars I will be madehollow and arranged to communicate with the hollow walls of the re-boxby means of hollow bolts I2, and to permit of the ready cleaning of thebars I the bolts I2 will be provided with plugs I3, by removing whichaccess may be had to the int-erior of the gratebars, as shown in Fig. l.

The construction herein shown and described is designed moreparticularly for locomotives.

Having thus described my invention, what I claim is-` l. In combinationwith the boiler A and the shell C, provided with the upturned end l ofhollow bolts H', and pipes G, connected at.

opposite ends with the parts D and H.

2. In combination with the boiler A and

